The Plates are Moving!

This is a crop of one of my favorite rock babies of all time -- from Dramala, it is harzburgite. The coarse bands are fairly innocuous harzburgite, but the light smoother looking bands are very very mylonitic bands. No, Bob, they might look like dunite, but with a very very very close look, you can see the sugar grained orthopyroxenes. Here also is what's fun: there are distinct fractures crossing the coarse harzburgite that are cut off by the mylonites, hah! This means -- that some brittle features predate this mylonitization (ductile) period. This, I like to think, is a tectonic plate in motion.

Is this fun, or what? For scale, the large chromite grain is about 3 mm across.